Broadband ferromagnetic resonance in Ni-Mn-Ga single crystal

IF 2.5 3区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Magnetism and Magnetic Materials Pub Date : 2025-06-27 DOI:10.1016/j.jmmm.2025.173330

Luděk Kraus, Denys Musiienko, Martin Kempa, Jaroslav Čapek

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Abstract

We present a broadband ferromagnetic resonance study in single crystalline Ni₅₀Mn_28.1Ga_21.9 in the temperature range from room temperature to 120 °C in which the transformation from martensite to austenite phase takes place. Our measurements demonstrate that a large change (an order of magnitude) in the magnetocrystalline anisotropy at the martensitic phase transformation results in a sharp change of the resonance magnetic field. In a single variant martensite phase, the resonance fields satisfy the Kittel’s resonance condition for a thin film with the gyromagnetic factor g = 2.0. With the magnetic field parallel to the easy c-axis of the single variant martensite, the resonance is observed only for frequencies larger than 22 GHz. For the multivariant martensite case, the magnetic coupling between the twin variants can be taken into account for the satisfactory Kittel’s fit. We observe a weak magnetocrystalline anisotropy in the austenite phase, just above the reverse martensite transformation, comparable to the previous reports based on different magnetic measurements.

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Ni-Mn-Ga单晶的宽带铁磁共振

本文对Ni50Mn28.1Ga21.9单晶在室温至120℃范围内由马氏体向奥氏体转变的过程进行了宽带铁磁共振研究。我们的测量表明，马氏体相变时磁晶各向异性的大变化（一个数量级）会导致共振磁场的急剧变化。在单变马氏体相中，共振场满足旋转磁因子g = 2.0的薄膜的基特尔共振条件。当磁场平行于单变马氏体的易c轴时，仅在大于22 GHz的频率上观察到共振。对于多变体马氏体，可以考虑双变体之间的磁耦合，以获得满意的基特尔拟合。我们观察到奥氏体相的弱磁晶各向异性，就在马氏体反向转变的上方，与之前基于不同磁测量的报告相当。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Magnetism and Magnetic Materials 物理-材料科学：综合

CiteScore

5.30

自引率

11.10%

发文量

1149

审稿时长

59 days

期刊介绍： The Journal of Magnetism and Magnetic Materials provides an important forum for the disclosure and discussion of original contributions covering the whole spectrum of topics, from basic magnetism to the technology and applications of magnetic materials. The journal encourages greater interaction between the basic and applied sub-disciplines of magnetism with comprehensive review articles, in addition to full-length contributions. In addition, other categories of contributions are welcome, including Critical Focused issues, Current Perspectives and Outreach to the General Public. Main Categories: Full-length articles: Technically original research documents that report results of value to the communities that comprise the journal audience. The link between chemical, structural and microstructural properties on the one hand and magnetic properties on the other hand are encouraged. In addition to general topics covering all areas of magnetism and magnetic materials, the full-length articles also include three sub-sections, focusing on Nanomagnetism, Spintronics and Applications. The sub-section on Nanomagnetism contains articles on magnetic nanoparticles, nanowires, thin films, 2D materials and other nanoscale magnetic materials and their applications. The sub-section on Spintronics contains articles on magnetoresistance, magnetoimpedance, magneto-optical phenomena, Micro-Electro-Mechanical Systems (MEMS), and other topics related to spin current control and magneto-transport phenomena. The sub-section on Applications display papers that focus on applications of magnetic materials. The applications need to show a connection to magnetism. Review articles: Review articles organize, clarify, and summarize existing major works in the areas covered by the Journal and provide comprehensive citations to the full spectrum of relevant literature.